WO2024035925A2 - N-cyclopropyl-1-(4-(4-(fluoro-18f)phényl)pyrimidin-5-yl)-n-méthylpipéridine-4-carboxamide et utilisations dans imagerie tep - Google Patents
N-cyclopropyl-1-(4-(4-(fluoro-18f)phényl)pyrimidin-5-yl)-n-méthylpipéridine-4-carboxamide et utilisations dans imagerie tep Download PDFInfo
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- WO2024035925A2 WO2024035925A2 PCT/US2023/030068 US2023030068W WO2024035925A2 WO 2024035925 A2 WO2024035925 A2 WO 2024035925A2 US 2023030068 W US2023030068 W US 2023030068W WO 2024035925 A2 WO2024035925 A2 WO 2024035925A2
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- brain
- carboxamide
- cyclopropyl
- phenyl
- pyrimidin
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Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
- C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
- C07D401/04—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings directly linked by a ring-member-to-ring-member bond
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/33—Heterocyclic compounds
- A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
- A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
- A61K31/505—Pyrimidines; Hydrogenated pyrimidines, e.g. trimethoprim
- A61K31/506—Pyrimidines; Hydrogenated pyrimidines, e.g. trimethoprim not condensed and containing further heterocyclic rings
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F5/00—Compounds containing elements of Groups 3 or 13 of the Periodic Table
- C07F5/02—Boron compounds
- C07F5/025—Boronic and borinic acid compounds
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07B—GENERAL METHODS OF ORGANIC CHEMISTRY; APPARATUS THEREFOR
- C07B2200/00—Indexing scheme relating to specific properties of organic compounds
- C07B2200/05—Isotopically modified compounds, e.g. labelled
Definitions
- Brain cholesterol homeostasis orchestrates the biosynthesis, transport, metabolism, and clearance of cholesterol from the mammalian central nervous system (CNS). Exchange of plasma and brain cholesterol is precluded by the blood-brain barrier. Brain cholesterol is synthesized by astrocytes and neurons. HMG-CoA reductase catalyzes the rate-limiting step in the biosynthesis of cholesterol, and cholesterol 24-hydroxylase, also referred to as cytochrome P450 46A1 or CYP46A1, facilitates the clearance of cholesterol from the CNS by mediating the conversion of cholesterol to 24-(S)-hydroxycholesterol, also referred to as hydroxycholesterol or 24S- hydroxycholesterol, which is a metabolite that readily penetrates the blood-brain barrier.
- CNS central nervous system
- Cholesterol turnover has physiological relevance in synaptic plasticity, learning, and memory.
- concentration of cholesterol in the brain is implicated in a variety of neurodegenerative, inflammatory, and vascular brain diseases. Underlying mechanisms are not fully understood. Hydroxycholesterol has been suggested as a potential biomarker for Alzheimer’s, Huntington’s disease, autism, epilepsy, depression, and Parkinson’s disease. Attempts to assess plasma concentrations of hydroxycholesterol as a surrogate measure for CYP46A1 activity in the brain have yielded conflicting results. An important consideration is that hydroxycholesterol is highly susceptible to metabolism in the liver.
- this disclosure relates to precursor compounds for generating N- cyclopropyl-1-(4-(4-(fluoro-18F)phenyl)pyrimidin-5-yl)-N-methylpiperidine-4-carboxamide such as N-cyclopropyl-N-methyl-1-(4-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl) pyrimidin-5-yl)piperidine-4-carboxamide or salts thereof.
- this disclosure relates to methods comprising: a) administering a composition comprising the tracer compound N-cyclopropyl-1-(4-(4-(fluoro- 18F)phenyl)pyrimidin-5-yl)-N-methyl piperidine-4-carboxamide isotopically enriched with fluorine 18 to a subject; and scanning the subject for emissions from an area of the subject.
- the N-cyclopropyl-1-(4-(4-(fluoro-18F)phenyl)pyrimidin-5-yl)-N- methylpiperidine-4-carboxamide tracer passes the blood brain barrier and emissions are from inside the brain or skull area.
- methods further comprise the step of detecting and/or measuring the emissions and creating an image indicating or highlighting the location of the compound isotopically enriched with fluorine 18 in the subject.
- methods comprise the step of detecting, measuring, and/or quantifying the emission providing an emission quantity and optionally correlating the emission measurement/detection/quantity to a concentration of cholesterol 24 ⁇ hydroxylase (cytochrome P45046A1) and/or 24S-hydroxycholesterol in the tissue, e.g., brain.
- methods further comprise the step of correlating a low, high, or abnormal measurement, quantity, or concentration of cholesterol 24 ⁇ hydroxylase (cytochrome P45046A1) and/or 24-hydroxycholesterol to the existence of or diagnosis of a subject at risk of a central nervous system disease or condition.
- the disease is Alzheimer’s disease, Huntington’s disease, autism, epilepsy, depression, and Parkinson’s disease, mild cognitive impairment, or other cognitive disorder or neurodegenerative disease.
- this disclosure relates to a PET imaging precursor compound N- cyclopropyl-N-methyl-1-(4-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)pyrimidin-5- yl)piperidine-4-carboxamide or salts thereof.
- this disclosure relates to method of making the N-cyclopropyl-1- (4-(4-(fluoro-18F)phenyl)pyrimidin-5-yl)-N-methylpiperidine-4-carboxamide tracer comprising contacting a precursor compound N-cyclopropyl-N-methyl-1-(4-(4-(4,4,5,5-tetramethyl-1,3,2- dioxaborolan-2-yl)phenyl)pyrimidin-5-yl)piperidine-4-carboxamide with an isotopically enriched fluorine 18 negative ion producing the PET imaging tracer N-cyclopropyl-1-(4-(4-(fluoro- 18F)phenyl)pyrimidin-5-yl)-N-methyl piperidine-4-carboxamide.
- the enriched fluorine 18 negative ion is a fluorine 18 potassium salt bound to a cryptand.
- this disclosure relates to kits comprising a precursor PET imaging compound disclosed herein and potassium ion bound to a cryptand.
- FIG. 1A illustrates the PET imaging compound 18F-CHL-2205 (18F-Cholestify) with the chemical name N-cyclopropyl-1-(4-(4-(fluoro-18F)phenyl)pyrimidin-5-yl)-N- methylpiperidine-4-carboxamide, and its preparation from the boron precursor, N-cyclopropyl-N- methyl-1-(4-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)pyrimidin-5-yl)piperidine-4- carboxamide.
- Figure 1B illustrates CYP46A1-mediated hydroxylation of cholesterol to 24S- hydroxycholesterol in the central nervous system (CNS).
- Figure 1C shows data from PET scans from an Alzheimer’s disease mouse model, 3xTg- AD, and respective control animals. Top: time-activity curves (TACs) under baseline conditions, where only the tracer is administered. Bottom: TACs under blockade conditions, where the tracer is administered together with an excess of nonradioactive CHL-2205 to diminish the number of enzymes that are available for tracer-CYP46A1 interactions.
- Figures 2A-2F show data indicating the ability to quantitative assess cholesterol metabolism in the living human brain.
- Figure 2A shows data from representative PET images of the human brain reflecting CYP46A1-rich brain regions, averaged from 0 to 90 min after tracer injection.
- Caudate/putamen are CYP46A1-rich regions
- the cerebellum is a CYP46A1-poor region.
- Quantitative data are depicted as standardized uptake values (SUVs) from respective individual scans.
- Figure 2B shows data from the distribution of 18F-CHL-2205 in the human brain presented as SUVs from 15 to 30 min after injection (SUV15–30) for the respective individual scans.
- Figure 2C shows a kinetic modeling assessment of tissue volumes of distribution (VT) for 18F-CHL-2205 in the human brain.
- VT tissue volumes of distribution
- Figure 2D shows data using a kinetic modeling assessment of nondisplaceable binding potentials (BPND) for 18F-CHL-2205 in the human brain.
- Figure 2E shows a correlation of PET signals averaged from 15 to 30 min after tracer injection with nondisplaceable binding potentials (BPND) in selected brain regions.
- Figure 2F shows analysis of postmortem human brain specimens by correlation of PET signals with Western blot analysis in selected brain regions.
- Embodiments of the present disclosure will employ, unless otherwise indicated, techniques of medicine, organic chemistry, biochemistry, molecular biology, pharmacology, and the like, which are within the skill of the art. Such techniques are explained fully in the literature. Prior to describing the various embodiments, the following definitions are provided and should be used unless otherwise indicated. It must be noted that, as used in the specification and the appended claims, the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise. In this specification and in the claims that follow, reference will be made to a number of terms that shall be defined to have the following meanings unless a contrary intention is apparent.
- the words “comprising” (and any form of comprising, such as “comprise” and “comprises”), “having” (and any form of having, such as “have” and “has”), “including” (and any form of including, such as “includes” and “include”) or “containing” (and any form of containing, such as “contains” and “contain”) have the meaning ascribed to them in U.S. Patent law in that they are inclusive or open-ended and do not exclude additional, unrecited elements or method steps.
- compositions like those disclosed herein that exclude certain prior art elements to provide an inventive feature of a claim but may contain additional composition components or method steps, etc., that do not materially affect the basic and novel characteristic(s) of the compositions or methods.
- Subject refers to any animal, preferably a human patient, livestock, rodent, monkey, or domestic pet. In certain embodiments, methods disclosed herein may make measurements that are compared to a normal or reference value.
- a “reference value” can be an absolute value; a relative value; an average value; a median value, a mean value, or a value as compared to a particular control or baseline value.
- a reference value can be based on an individual sample or many samples, such as from patients or normal individuals.
- a “normalized measured” value refers to a measurement taken and adjusted to take background into consideration. Background subtraction to obtain total fluorescence is considered a normalized measurement. The background subtraction allows for the correction of background fluorescence that is inherent in the optical system and assay buffers.
- a “test compound” can be any variety of organic compounds such as small molecules, proteins, antibodies, nucleobases, nucleobase polymers, and known therapeutic agents or therapeutic candidates.
- cell culture or “growth medium” or “media” refers to a composition that contains components that facilitate cell maintenance and growth through protein biosynthesis, such as vitamins, amino acids, inorganic salts, a buffer, and a fuel, e.g., acetate, succinate, a saccharide/disaccharide/polysaccharide, medium chain fatty acids, and/or optionally nucleotides.
- a fuel e.g., acetate, succinate, a saccharide/disaccharide/polysaccharide, medium chain fatty acids, and/or optionally nucleotides.
- Typical components in a growth medium include amino acids (histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, valine, and others); vitamins such as retinol, carotene, thiamine, riboflavin, niacin, biotin, folate, and ascorbic acid; carbohydrate such as glucose, galactose, fructose, or maltose; inorganic salts such as sodium, calcium, iron, potassium, magnesium, zinc; serum; and buffering agents. Additionally, a growth medium may contain a pH indicator, e.g., phenol red.
- Components in the growth medium may be derived from blood serum or the growth medium may be serum-free.
- the growth medium may optionally be supplemented with albumin, lipids, insulin and/or zinc, transferrin or iron, selenium, ascorbic acid, and an antioxidant such as glutathione, 2-mercaptoethanol or 1-thioglycerol.
- Other contemplated components contemplated in a growth medium include ammonium metavanadate, cupric sulfate, manganous chloride, ethanolamine, and sodium pyruvate.
- Various growth mediums are known in the art.
- MEM Minimal Essential Medium
- thiamine vitamin B1
- riboflavin vitamin B2
- nicotinamide vitamin B3
- pantothenic acid vitamin B5
- pyridoxine vitamin B6
- folic acid vitamin M
- choline choline
- inositol originally known as vitamin B8
- Dulbecco's modified Eagle's medium is a growth medium which contains additional components such as glycine, serine, and ferric nitrate with increased amounts of vitamins, amino acids, and glucose.
- Animal serum such as fetal bovine serum (FBS) is sometimes added to a growth media as a supplement.
- PET Pulsitron emission tomography
- PET refers to an imaging technique that produces an image, e.g., three-dimensional image, by detecting pairs of gamma rays emitted indirectly by a positron-emitting radionuclide tracer. Images of tracer concentration within the area are then constructed by computer analysis. A radioactive tracer is administered to a subject e.g., into blood circulation.
- the subject is placed in the imaging scanner.
- the radionuclide undergoes positron emission decay, it emits a positron, an antiparticle of the electron with opposite charge, until it decelerates to a point where it can interact with an electron, producing a pair of (gamma) photons moving in approximately opposite directions.
- the technique typically utilizes simultaneous or coincident detection of the pair of photons moving in approximately opposite direction. Photons that do not arrive in pairs (i.e., within a timing-window) are typically ignored.
- radioactive isotope refers to molecules of enriched isotopes that exhibit radioactive decay (e.g., emitting positrons). Such isotopes are also referred to in the art as radioisotopes.
- a radionuclide tracer does not include radioactive primordial nuclides but does include naturally occurring isotopes that exhibit radioactive decay with an isotope distribution that is enriched, i.e., greater than natural abundance.
- the radionuclides are limited to those with a half live of less than 1 hour and those with a half- life of more than 1 hour but less than 24 hours.
- Radioactive isotopes are named herein using various commonly used combinations of the name or symbol of the element and its mass number (e.g., 18F, F-18, or fluorine-18).
- isotopically labeled compounds are useful in metabolic studies, reaction kinetic studies, detection, or imaging techniques [such as positron emission tomography (PET) or single- photon emission computed tomography (SPECT)] including drug or substrate tissue distribution assays.
- PET positron emission tomography
- SPECT single- photon emission computed tomography
- an 18 F or 11 C labeled compound may be particularly preferred for PET or SPECT studies.
- the [ 18 F] isotope is then separated from water and processed for production of a radiopharmaceutical agent.
- fluoride recovery is based on ion exchange resins.
- the recovery is carried out in two steps (extraction and elution): first the anions (not only fluoride) are separated from the enriched [ 18 O] water and trapped on a resin and then, said anions, including [ 18 F] fluoride, are eluted into a mixture containing water, organic solvents, a base, also called activating agent or phase transfer agent or phase transfer catalyst, such as the complex potassium carbonate-Kryptofix 222 TM (K 2 CO 3 -K 222 ) or a tetrabutylammonium salt.
- Kryptofix 222 TM is a cyclic crown ether, which binds the potassium ion, preventing the formation of 18 F–KF.
- potassium acts as the counter ion of 18 F – to enhance its reactivity but does not interfere with the synthesis.
- Typical labeling methods use low water content solutions.
- An evaporation step may follow the recovery of the [ 18 F]fluoride, e.g., azeotropic evaporation of acetonitrile or other low boiling temperature organic solvent.
- the extraction process is performed by passing the [ 18 F] aqueous solution on a solid support as reported in U.S. Patent 8,641,903.
- This solid support is typically loaded with a trapping agent, e.g., compound comprising a quaternary amine that is adsorbed on the solid support and allows the [ 18 F] activity to be trapped because of its positive charge.
- the solid support is then flushed with a gas or a neutral solvent to remove or push out most of the residual water.
- the [ 18 F] is eluted in an organic solvent or in a mixture of organic solvents and is usable for labelling of precursor compounds.
- Certain of the compounds described herein may contain one or more asymmetric centers and may give rise to enantiomers, diastereomers, and other stereoisomeric forms that can be defined, in terms of absolute stereochemistry at each asymmetric atom, as (R)- or (S)- or in terms of the ability to bend plan polarized light in the positive or negative direction.
- a compound disclosed herein comprising a radionuclide is administered to a subject, and the radionuclide in the subject is used to create an image.
- the radionuclide can be administered at any suitable dose.
- the subject can be imaged using any suitable imaging apparatus, for example an apparatus capable of gathering a magnetic resonance image (MRI), a positron emission tomography (PET) scan, or a computed tomography (CT) scan.
- MRI magnetic resonance image
- PET positron emission tomography
- CT computed tomography
- methods entail administering to a subject (which can be human or animal, for experimental and/or diagnostic purposes) an image-generating amount of a compound of the disclosure, labeled with the appropriate isotope and then measuring the distribution of the compound by PET.
- An image-generating amount is that amount which is at least able to provide an image in a PET scanner considering the detection sensitivity and noise level of the scanner, the age of the isotope, the body size of the subject and route of administration.
- Methods disclosed herein may be combined with other methods such as single photon emission computed tomography (SPECT) scans, computerized tomography (CT) scans, and MRI.
- SPECT single photon emission computed tomography
- CT computerized tomography
- a CT scan combines a series of X-ray images taken from different angles uses computer processing to create cross-sectional images, or slices of the brain, bones, blood vessels and soft tissues inside a body. These scans or associated data can be used to create computerized images that take place in tissue.
- a scanner records data, and a computer constructs two- or three- dimensional images.
- the amount effective to result in uptake of the tracer compound into the cells or tissue of interest will depend upon a variety of factors, including for example, the age, body weight, general health, sex, and diet of the host; the time of administration; the route of administration; the rate of excretion of the specific compound employed; the duration of the treatment; the existence of other drugs used in combination or coincidental with the specific composition employed; and like factors.
- Preferred imaging methods provided by the present disclosure include the use of the radionuclide containing compounds of the present disclosure and/or salts thereof that can generate at least a 2:1 target to background ratio of radiation intensity, or more preferably about a 5:1, about a 10:1 or about a 15:1 ratio of radiation intensity between target and background.
- the radiation intensity of the target tissue is more intense than that of the background.
- the present disclosure provides methods where the radiation intensity of the target tissue is less intense than that of the background.
- any difference in radiation intensity between the target tissue and the background that is sufficient to allow for identification and visualization of the target tissue is sufficient for use in the methods of the present disclosure.
- the compounds of the present disclosure are excreted from tissues of the body quickly to prevent prolonged exposure to the radiation of the radiolabeled compound administered to the patient.
- the radionuclide tracer provided herein can be used on an outpatient basis.
- compounds of the present disclosure are eliminated from the body in less than about 24 hours.
- Images can be generated by virtue of differences in the spatial distribution of the imaging agents that accumulate at a site.
- the spatial distribution may be measured using any imaging apparatus suitable for the imaging agent, for example, a gamma camera, a PET apparatus, a SPECT apparatus, MRS, MRI, or optical imaging apparatus, and the like.
- the extent of accumulation of the imaging agent may be quantified using known methods for quantifying radioactive emissions.
- a particularly useful imaging approach employs more than one imaging agent to perform simultaneous studies.
- the imaging method may be carried out a plurality of times with increasing administered doses.
- the amount of imaging agent used for diagnostic purposes and the duration of the imaging study will depend upon the radionuclide used to label the agent, the body mass of the patient, the nature and severity of the condition being treated, the nature of therapeutic treatments which the patient has undergone, and on the idiosyncratic responses of the patient. Ultimately, the attending physician will decide the amount of imaging agent to administer to each individual patient and the duration of the imaging study.
- a radioactive compound is injected into the subject, e.g., through a vein, and a scanner is used to make detailed images of areas inside the body over time where the radioactive material is taken up by the cells, tissue, fluids, or organs.
- this disclosure relates to imaging methods comprising a) administering a N-cyclopropyl-1-(4-(4-(fluoro-18F)phenyl)pyrimidin-5-yl)-N-methyl piperidine- 4-carboxamide tracer to a subject; and b) scanning the subject for the emission/positron-emissions.
- the methods typically further comprise the steps of detecting the emissions and creating an image of an area of the subject indicating or highlighting the location of the compound containing the radionuclide in the subject.
- the area of the subject is the central nervous system, brain, spinal cord, lymph nodes, groin, axilla, neck, lungs, liver, kidney, pancreas, stomach, balder, intestines, circulatory system, breast, prostate, or gallbladder.
- the tracer may be administered by any suitable technique known in the art, such as direct injection. Injection may be an intravenous (IV) injection. Administration may be general or local to the site of interest.
- the tracer may be used in conjunction with another probe, for example a fluorescent probe.
- the two (or more) probes may be administered together, separately, or sequentially.
- the tracer of the present disclosure may be used to diagnose, assess, or monitor the progression or treatment of a disease or condition reported herein.
- the tracer of the present disclosure may be used to investigate the effects of a test compound.
- N-cyclopropyl-1-(4-(4-(fluoro-18F)phenyl)pyrimidin-5-yl)-N-methyl piperidine-4-carboxamide may be administered together with a test compound, to evaluate the effect of the test compound be assayed in real time in vivo using a method in accordance with the present disclosure.
- this disclosure relates to methods comprising: a) administering a composition comprising the N-cyclopropyl-1-(4-(4-(fluoro-18F)phenyl)pyrimidin-5-yl)-N-methyl piperidine-4-carboxamide tracer isotopically enriched with fluorine 18 to a subject; and scanning the subject for emissions from an area of the subject.
- the N-cyclopropyl-1-(4-(4-(fluoro-18F)phenyl)pyrimidin-5-yl)- N-methylpiperidine-4-carboxamide tracer passes the blood brain barrier and emissions are from inside the brain or skull area.
- methods further comprise the step of detecting and/or measuring the emissions and creating an image indicating or highlighting the location of the compound isotopically enriched with fluorine 18 in the subject.
- methods comprise the step of detecting, measuring, and/or quantifying the emission providing an emission quantity and optionally correlating the emission measurement/detection/quantity to a concentration of cholesterol 24 ⁇ hydroxylase (cytochrome P45046A1) and/or 24S-hydroxycholesterol in the brain or other area, e.g., of the central nervous system.
- methods further comprise the step of correlating a high or abnormal measurement, quantity, or concentration of cholesterol 24 ⁇ hydroxylase (cytochrome P45046A1) and/or 24-hydroxycholesterol to the existence of or diagnosis of a subject at risk of a central nervous system disease or condition.
- the disease is Alzheimer’s disease, Huntington’s disease, autism, epilepsy, depression, Parkinson’s disease, a cognitive or memory disorder, or other neurodegenerative disease.
- this disclosure relates to method of making a PET imaging agent, i.e., the N-cyclopropyl-1-(4-(4-(fluoro-18F)phenyl)pyrimidin-5-yl)-N-methylpiperidine-4- carboxamide tracer, comprising contacting a precursor compound N-cyclopropyl-N-methyl-1-(4- (4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)pyrimidin-5-yl)piperidine-4- carboxamide with an isotopically enriched fluorine 18 negative ion producing the PET imaging tracer N-cyclopropyl-1-(4-(4-(fluoro-18F)phenyl)pyrimidin-5-yl)-N-methyl piperidine-4- carboxamide.
- a precursor compound N-cyclopropyl-N-methyl-1-(4- (4-(4,4,5,5-tetramethyl-1,3,2-dioxa
- the enriched fluorine 18 negative ion is a fluorine 18 potassium salt bound to a cryptand.
- methods disclosed herein are used to detect, measure, quantify, assess, diagnose, or evaluate in a subject hydroxycholesterol, or cholesterol 24-hydroxylase concentrations or cholesterol metabolism in a subject suspected of having, being at risk of, or diagnosed with a CNS disorder, neurodegenerative disorder, cognitive disorder, age- and/or sex- related brain disorder.
- this disclosure relates to methods of administering the N- cyclopropyl-1-(4-(4-(fluoro-18F)phenyl)pyrimidin-5-yl)-N-methylpiperidine-4-carboxamide tracer in combination with CYP46A1-targeted drug or a test compound to a subject and imaging, detecting, measuring, or quantifying the PET signal in a tissue, brain, or portion/segment thereof, of the subject in order to evaluate the ability of a test compound or CYP46A1-targeted drug to bind CYP46A enriched tissue of the subject.
- methods further comprise determining whether a subject is or would likely be responsive to a CYP46A1-targeted drug or test compound therapy.
- the CYP46A1-targeted drug is voriconazole, thioperamide, or soticlestat.
- the subject has, is suspected of having, at risk of, or diagnosed with a CNS disorder, neurodegenerative disorder, cognitive disorder, impaired memory, or other brain disorder.
- the imaging, detecting, measuring, or quantifying of the PET signal indicates the N-cyclopropyl-1-(4-(4-(fluoro-18F)phenyl)pyrimidin-5-yl)-N- methylpiperidine-4-carboxamide tracer binds to the CYP46A enriched tissue of the subject that is lower than a normal or reference value absent the test compound, then said imaging, detecting, measuring, or quantifying provides an indication that the test compound or CYP46A1-targeted drug is binding or likely binding with sufficient affinity to CYP46A1 in the subject to be effective as a potential therapeutic agent.
- methods further comprise the step of administering an effective amount of the test compound or CYP46A1-targeted drug to a subject in need thereof.
- the imaging, detecting, measuring, or quantifying of the PET signal indicates that the N-cyclopropyl-1-(4-(4-(fluoro-18F)phenyl)pyrimidin-5-yl)-N- methylpiperidine-4-carboxamide tracer binds to the CYP46A enriched tissue of the subject is normal when compared to a reference value, then that is an indication that the test compound or CYP46A1-targeted drug is not binding or not binding with sufficient affinity to CYP46A1 in the subject to be effective as a potential therapeutic agent.
- methods further comprise the step of recording the imaging, detecting, measuring, or quantifying data or diagnostic indications therefrom on a computer readable medium. In certain embodiments, methods further comprise the step of reporting the imaging, detecting, measuring, or quantifying data or diagnostic indications therefrom to a medical professional.
- this disclosure relates to methods of diagnosing and treating a subject with a neurodegenerative disease or cognitive disorder, condition comprising, administering an effective amount of N-cyclopropyl-1-(4-(4-(fluoro-18F)phenyl)pyrimidin-5-yl)- N-methyl piperidine-4-carboxamide to a subject in need thereof; measuring 18 F brain emissions from the subject; comparing the 18 F brain emission to a normal or reference value; and diagnosing the subject with or at risk of a neurodegenerative disease, or cognitive disorder, if the emission is lower or higher than normal; and treating the subject by administering to the subject an effective amount of a therapeutic agent directed to a neurodegenerative disease or cognitive disorder.
- the therapeutic agent is vector encoding a recombinant CYP46A1.
- this disclosure relates to a cell culture or growth medium comprising N-cyclopropyl-1-(4-(4-(fluoro-18F)phenyl)pyrimidin-5-yl)-N-methyl piperidine-4- carboxamide or salt thereof.
- this disclosure relates to evaluating or monitoring the effectiveness of a drug therapy or recombinant therapy comprising administering a drug for treating a neurodegenerative diseases or condition, or a vector encoding a recombinant CYP46A1, e.g., adeno-associated vector therapy, for expression in brain or other CNS tissues, in combination with, or sometime after, the N-cyclopropyl-1-(4-(4-(fluoro-18F)phenyl)pyrimidin-5-yl)-N- methylpiperidine-4-carboxamide tracer, and thereafter imaging, detecting, measuring, or quantifying the tracer at a location in the subject.
- a recombinant CYP46A1 e.g., adeno-associated vector therapy
- the subject is a human subject 2, 12, or 16 years old or older or less than 2, 12, or 16 years old. In certain embodiments, the subject is a human subject 55 or 65 years old or older. In certain embodiments, the subject is a human subject greater than 55, 60, 65, or 70 years of age. In certain embodiments, the subject is an infant, e.g., from one month to two years of age. In certain embodiments, the subject is a human subject such as a child, e.g., from two to twelve years of age. In certain embodiments, the subject is a human subject such as an adolescent, e.g., from twelve to sixteen years of age. In certain embodiments, the subject is a human subject sixteen years of age or older.
- kits comprising a N-cyclopropyl-1-(4-(4- (fluoro-18F)phenyl)pyrimidin-5-yl)-N-methylpiperidine-4-carboxamide tracer and/or precursor compounds, e.g. N-cyclopropyl-N-methyl-1-(4-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2- yl)phenyl)pyrimidin-5-yl)piperidine-4-carboxamide and instructions for use.
- the instructions provide for the activity at the end of synthesis.
- the instructions provide for the half-life of the radionuclide.
- the instructions provide that injection should be used within limited time from the time of the end of synthesis.
- the container is a sealed container such as a septum capped vial.
- this disclosure relates to kits comprising the precuror N- cyclopropyl-N-methyl-1-(4-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)pyrimidin-5- yl)piperidine-4-carboxamide and starting materials to make the radionuclide tracer N-cyclopropyl- 1-(4-(4-(fluoro-18F)phenyl)pyrimidin-5-yl)-N-methyl piperidine-4-carboxamide, and/or a substance for preparing a radionuclide in a cyclotron.
- kits comprise a container having water, H 2 18 O, and/or ethanol in water solution.
- the container is sealed from the atmosphere.
- kits comprise a solid support or filter.
- the filter may be used to purify a radionuclide tracer disclosed herein.
- the N-cyclopropyl-1-(4-(4-(fluoro-18F)phenyl)pyrimidin-5-yl)- N-methylpiperidine-4-carboxamide tracer may be prepared at the location of the subject near the time the subject is exposed to an imaging device.
- kits comprising the precursor compound N-cyclopropyl-N-methyl-1-(4-(4-(4,4,5,5- tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)pyrimidin-5-yl)piperidine-4-carboxamide and a solid support.
- the solid support is selected from the group of solid phase extraction resins or liquid chromatography resins, e.g., silica (oxide) based or non-silica (metal oxide or polymers) based particles optionally functionalized (e.g., by organosilanization) with alkyl chains for example C4, C8, C18, C30 or other functional groups, e.g., polar groups (amide, carbamate, and urea) embedded within alkyl chains or branched alkyl groups or polymeric packings.
- solid phase extraction resins or liquid chromatography resins e.g., silica (oxide) based or non-silica (metal oxide or polymers) based particles optionally functionalized (e.g., by organosilanization) with alkyl chains for example C4, C8, C18, C30 or other functional groups, e.g., polar groups (amide, carbamate, and urea) embedded within alkyl chains or branched alkyl groups or poly
- the solid support is selected from the group consisting of solid phase extraction resins and liquid chromatography resins resulting from the copolymerization of divinylbenzene and/or styrene, or by the copolymerization with vinylpyrrolidone, vinylacetate, (methacryloyloxymethyl)naphtalene, 4,4′-bis(maleimido)diphenylmethane, p,p′-dihydroxy diphenylmethane diglycidylmethacrylic ester, p,p′-dihydroxydiphenylpropane diglycidylmethacrylic ester, 2-hydroxyethylmethacrylate (HEMA), 2,2- dimethylaminoethylmethacrylate (DMAEMA), ethylenedimethacrylate glycidylmethacrylate, N- vinylcarbazole, acrylonitrile, vinylpyridine, N-methyl-N-vinylacetamide, aminostyrene
- the solid support comprises or is functionalized with or preconditioned with: quaternary ammonium salts, e.g., tetraethylammonium carbonate, tetrabutylammonium carbonate; potassium carbonate cryptands such as [2.2.2] cryptand N(CH 2 CH 2 OCH 2 CH 2 OCH 2 CH 2 ) 3 N, 1,4,10-trioxa-7,13-diaza-cyclopentadecane, 4,7,13,16,21,24- hexaoxa-1,10-diazabicyclo[8.8.8]hexacosane, 4,7,13,16,21-pentaoxa-1,10-diazabicyclo[8.8.5] tricosane, 4,7,13,18-tetraoxa-1,10-diazabicyclo[8.5.5] eicosane, 5,6-benzo-4,7,13,16,21,24-
- compositions comprising N-cyclopropyl-1-(4-(4-(fluoro-18F)phenyl)pyrimidin-5-yl)-N-methylpiperidine-4-carboxamide or salt thereof or a precursor compound disclosed herein such as N-cyclopropyl-N-methyl-1-(4- (4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)pyrimidin-5-yl)piperidine-4- carboxamide or salt thereof or and a pharmaceutically acceptable excipient.
- the disclosure relates to a pharmaceutical composition
- a pharmaceutical composition comprising a compound as described herein including salts thereof and a pharmaceutically acceptable excipient, diluent, or carrier.
- the pharmaceutical composition is in the form of a powder, liquid, or aqueous buffered solution.
- the buffered solution is a citrate buffered solution, isotonic solution, sterile solution, pyrogen free solution, endotoxins and exotoxins free solution, lipopolysaccharide free solution, and/or bacterial free solution.
- Pharmaceutical compositions disclosed herein may be in the form of pharmaceutically acceptable salts.
- Some preferred, but non-limiting examples of pharmaceutically acceptable acids for salt formation are hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, acetic acid, ascorbic acid, and citric acid, as well as other pharmaceutically acceptable acids known per se.
- Assessment of cholesterol homeostasis in the living human brain A CYP46A1-targeted positron emission tomography (PET) tracer was developed and tested in animal models and in humans. The probe provides accurate noninvasive quantification of CYP46A1 abundancy and cholesterol metabolism across different regions of the rodent, nonhuman primate (NHP), and human brain. The tracer is sensitive to differences in brain cholesterol metabolism between mouse model of Alzheimer’s disease (3xTg-AD mice) and wild- type animals.
- PET imaging readouts correlate with CYP46A1 protein expression and with the extent to which cholesterol is metabolized in the brain.
- In vivo efficacy is provided in the well-established 3xTg-AD murine model of Alzheimer’s disease (AD), where experiments indicate that the probe is sensitive to differences in brain cholesterol metabolism between 3xTg-AD mice and control animals.
- AD Alzheimer’s disease
- Experiments indicate that there is a considerably higher baseline brain cholesterol clearance via CYP46A1 in women, as compared to age-matched men.
- Impaired neuronal cholesterol homeostasis is believed to be linked to several common neurological disorders including AD.
- Small-animal PET imaging indicates an enhanced CYP46A1-related signal in the brains of 3xTg-AD mice, as compared to control animals. It is contemplated that CYP46A1 function is enhanced in early AD, as an attempt to eliminate excess neuronal cholesterol and attenuate further accumulation of amyloidogenic cholesterol esters. Patients with advanced AD tend to present with blunted concentrations of 24- hydroxycholesterol, potentially owing to the loss of neurons in CYP46A1-expressing brain areas.
- PET tracer colocalizes with CYP46A1 and 24-hydroxycholersterol in the rodent brain
- a highly potent ligand for CYP46A1 was labeled with fluorine-18 via the boronic pinacol ester precursor compound, N- cyclopropyl-N-methyl-1-(4-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)pyrimidin-5- yl)piperidine-4-carboxamide (Fig. 1A).
- the resulting PET tracer 18F-CHL-2205 (named 18F- Cholestify), exhibited a selectivity for CYP46A1-rich areas of the rodent brain by in vitro autoradiography. Highest tracer binding was observed in the CYP46A1-rich cortical, hippocampal, striatal, and thalamic structures, whereas lower abundancy was detected in the cerebellum.
- the tracer distribution matched closely with the Allen Brain Atlas distribution of CYP46A1 expression data in the mouse brain. Quantification of CYP46A1 by Western blot analysis in the same brain regions confirmed that tracer binding patterns were in concert with CYP46A1 expression across all tested brain regions.
- Cholesterol interacts with the orthosteric CYP46A1 binding site, triggering its conversion to 24S-hydroxycholesterol in the mammalian brain (Fig.1B).
- Fig.1B To define the molecular interactions between 18F-CHL-2205 and CYP46A1, docking studies were conducted using reported crystal structures of CYP46A1. Of the available crystal structures, PDB:3MDT, PDB:7LRL and PDB:3MDM were used.
- HEK human embryonic kidney
- hCYP46A1 human CYP46A1
- a consideration in CNS-targeted PET constitutes the ability of the tracer to selectivity bind to a target protein while lacking interactions with other abundant brain proteins.
- PET signal serves as a noninvasive surrogate measure for the extent of cholesterol turnover to 24-hydroxycholesterol across different brain regions.
- Tracer binding was assessed and validated in the 3xTg-AD mouse model. This model is widely used and exhibits some similarities with histopathological and behavioral features of clinical AD.
- Hippocampal uptake of the CYP46A1 tracer was compared between 3xTg-AD mice and respective controls. After intravenous administration of the CYP46A1 tracer, time-activity curves (TACs) were consistently higher in the hippocampus of 3xTg-AD mice than in controls, pointing toward an increased metabolic clearance of brain cholesterol by CYP46A1 in the AD model (Fig. 1C).
- the signal intensity of tracer binding correlated with high abundancy regions for CYP46A1, including the putamen, caudate, and limbic cortical regions such as superficial layers of temporal, insular, and cingulate cortex, as evidenced by in vitro autoradiograms of the brain.
- CYP46A1 the signal intensity of tracer binding correlated with high abundancy regions for CYP46A1, including the putamen, caudate, and limbic cortical regions such as superficial layers of temporal, insular, and cingulate cortex, as evidenced by in vitro autoradiograms of the brain.
- the tracer 18F-CHL-2205 was injected intravenously to rhesus monkeys, and the TACs in the brain were recorded by PET over a scan duration of 90 min. Regional brain distributions were consistent between in vitro autoradiograms and in vivo PET.
- PET image reflects a balance between multiple dynamic molecular processes that may include tracer delivery to the brain, binding to the desired target protein, potential metabolism or cellular internalization, and washout from the brain.
- kinetic modeling was performed and tissue volumes of distribution (VT) and nondisplaceable binding potentials (BP ND ) were calculated from a two-tissue compartment model.
- VT constitutes the ratio of tracer concentrations in the target region versus in the plasma at equilibrium, whereas BPND can be considered a quantitative index of in vivo target abundancy.
- VT values across different brain regions revealed a comparable pattern to what was observed from PET images.
- PET postmortem brain tissue
- PET versus Western blot analysis suggest that PET imaging reflects the abundancy of CYP46A1 across different brain regions of NHPs.
- Quantitative assessment of cholesterol metabolism in the living human brain Eight healthy participants underwent a PET scan with 18F-CHL-2205, followed by a magnetic resonance imaging (MRI) scan for anatomical orientation. Because of the physical half- life of fluorine-18 (109.8 min), the tracer was produced on the day of the experiment in a designated hot cell that provided shielding from radiation exposure and was equipped with an automated synthesis module.
- MRI magnetic resonance imaging
- PET scans were performed for a duration of 90 min, and the data were subsequently reconstructed to allow the assessment of tracer uptake as a surrogate for CYP46A1 abundancy and cholesterol metabolism.
- Averaged standardized uptake values for a PET scan duration of 90 min revealed a heterogeneous tracer accumulation pattern in the human brain, with areas of high radioactivity in the cortical, thalamic, and basal ganglia regions.
- brain areas with limited CYP46A1 abundancy such as the cerebellum, brainstem, and corpus callosum revealed the lowest tracer accumulation (Fig.2A).
- HEK-CYP46A1 enzyme–HEK cell line
- HEK control cells were cultured in Dulbecco’s modified Eagle’s medium (DMEM) supplemented with 10% fetal bovine serum and antibiotics (0.1 mg/ml streptomycin and 100 IU/ml penicillin).
- DMEM Dulbecco’s modified Eagle’s medium
- antibiotics 0.1 mg/ml streptomycin and 100 IU/ml penicillin
- Cells were kept under standard conditions at 37°C and 5% CO2 and subsequently subpassaged using a solution of 0.25% trypsin and 0.02% EDTA.
- HEK-CYP46A1 and HEK control cells were seeded into a 24-well plate at a density of 2 ⁇ 10 5 cells per well the day before the experiment.
- the medium was replaced with fresh DMEM including 18 F-CHL-2205 (ca.74 kBq per well) and incubated at 37°C for 15, 30, and 45 min. The supernatant was collected, and the cells were washed twice with cold 1 ⁇ phosphate- buffered saline (PBS) and then harvested by adding 200 ⁇ l of 1N NaOH followed by additional two times rinsing with 1 ⁇ PBS.
- the blocking assay was performed with the HEK-CYP46A1 cells. The nonradioactive compound, soticlestat, was added in various concentrations. The incubation time was 1 hour, and the washing steps were repeated once.
- mice were allowed to acclimatize for at least 1 week before the start of the experimental procedures.
- Mice and rats were anesthetized with isoflurane and scanned in a ⁇ PET/computed tomography (CT) scanner for 60 min after tail-vein injection of 18F-CHL-2205. Data were reconstructed in user-defined time frames.
- Time-activity curves were calculated with predefined regions of interest. Results are presented as area under the curve (AUC) from the respective TACs of SUVs, indicating the decay-corrected radioactivity per cubic centimeter, divided by the injected dose per gram of body weight.
- PET/CT and MRI studies in rhesus monkeys Four rhesus monkeys (4.8 to 9.3 kg) were anesthetized by intramuscular injection of ketamine (10 mg/kg) and then put on the MRI scanning bed in the supine position. Whole-brain images were acquired.
- the subjects were initially anesthetized with ketamine (10 mg/kg, intramuscularly), put on the scanning bed, and maintained under anesthesia with 2% isoflurane and 98% oxygen. All rhesus monkeys were supine, and a stereotactic frame was used to fix the position of the head.
- a bolus intravenous injection of 18F-CHL-2205 (104 to 176 MBq, 0.38 to 1.49 ⁇ g) was performed into the monkey through an intravenous catheter, followed by a dynamic PET scan of the head for 90 min.
- the CYP46A1 inhibitor soticlestat was administered intravenously at doses of 0.0009, 0.0016, 0.014, 0.016, 0.05, 0.12, 0.32, and 0.34 mg/kg, followed by the injection of 18F-CHL-2205.
- PET/CT and MR images were co-registered.
- TACs were derived from the respective volumes of interest and were presented as SUVs, which were decay-corrected to the time of radioligand injection.
- Plasma radiometabolite analysis was performed by collecting additional arterial blood samples (1.0 to 2.5 ml) at 2, 10, 30, 60, and 90 min after injection. These samples were then centrifuged at 6500 rpm at 4°C for 5 min.
- Portions of the plasma (ca.0.4 ml) were deproteinated using the same volume of ice-cold acetonitrile, vortexed, and separated by centrifugation for 3 min at 14,500 rpm and 4°C.
- the supernatant was mixed with 0.02 ml of CH 3 CN in which the reference compound CHL-2205 (ca. 0.02 mg) was dissolved.
- the mixture was injected into a high-performance liquid chromatography (HPLC) system equipped with a semipreparative HPLC column and an ultraviolet detector with the wavelength set at 254 nm.
- HPLC high-performance liquid chromatography
- the mobile phase consisted of acetonitrile/water (9:1, v/v), and the flow rate was 2.0 ml/min.
- Prespecified outcomes of this study included tracer kinetics and distribution volumes of 18F-CHL-2205 in the brain, adverse events for up to 10 days after intravenous bolus administration of the tracer.
- All subjects underwent a dynamic 90-min PET and MRI scan after injection of 18F-CHL-2205 (173.9 to 305.8 MBq, 1.57 to 3.63 ⁇ g).
- Individual MRI images were used for anatomical orientation and to delineate volumes of interest.
- Vital sign and electrocardiogram records were taken just before and after the scans.
- Two-tissue compartment model analyses were conducted using image-derived input functions from the carotid arteries, which provided excellent model fits. Volumes of distribution were further determined by Logan graphical analysis and were used to calculate binding potentials.
- PET data are presented as SUVs, averaged from 0 to 90 min (SUV0–90) or from 15 to 30 min (SUV15–30) after injection.
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Abstract
Sont présentement divulgués un composé traceur TEP N-cyclopropyl-1-(4-(4-(fluoro-18f)phényl)pyrimidin-5-yl)-N-méthylpipéridine-4-carboxamide ou un sel de celui-ci, et ses utilisations en tant qu'agent d'imagerie. Dans certains modes de réalisation, la présente divulgation concerne des composés précurseurs tels que le N-cyclopropyl-N-méthyl-1-(4-(4-(4,4,5,5-tétraméthyl-1,3,2-dioxaborolan-2-yl)phényl)pyramidale-5-yl)pipéridine-4-carboxamide ou un sel de celui-ci et des kits les comprenant.
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